How To Add Doubles From A Text File

I have a text file that looks like this:

JacobAndrews8159RoseCtMill CityOR97322555212787964.00
RyanPerkins7546PrinceAveLas VegasNV87126555345198913.00
JoshuaGilbert9278MonroeDrCorvallisCA97330555283265695.00
MilesCrain4578ChesterDrCorvallisOR9733155523456781544.00
ButchCassidy5498SuttonPlGresham AZ9738054165657971798.56
PerryWinkle8185ShaverAveLas VegasNV871265553812346195.66

everything is separated by tabs.

My while loop is like this:

while(fileScan.hasNextLine()) {
String currentLine = fileScan.nextLine();
String[]dataSet = currentLine.split(" ");
String zip = dataSet[7];
String phone = dataSet[8];
String donation = dataSet[9];
int ZIP = Integer.parseInt(zip);
Double Donation = Double.parseDouble(donation);

As you can see I made the donation read as a double, my question is how do I get the donation total? I need to write the code to add up and get the total donations but cannot figure it out.